https://gcc.gnu.org/bugzilla/show_bug.cgi?id=123737
Bug ID: 123737
Summary: GCC produces incorrect output when overloading
operator, comma operator
Product: gcc
Version: 15.1.1
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: jlame646 at gmail dot com
Target Milestone: ---
The following program's output is unexpected and differs from clang and msvc:
https://godbolt.org/z/j6a1811d4
```
#include <cstddef>
#include <iostream>
struct Counter { // Counts number of `operator,` calls
std::size_t count = 0;
Counter& operator,(int) {
++count;
return *this;
}
void finish(const char* label, std::size_t expected) const {
std::cout << label << ": count=" << count << " expected=" << expected <<
"\n";
}
};
int main() {
Counter c130;
c130, // an array of 130 zeros
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0,0;
c130.finish("131", 131);
return 0;
}
```
GCC outputs:
```
131: count=3 expected=131
```
while the expected output is:
```
131: count=131 expected=131
```
